[PATCH 7/7] add a new interface to show the memory usage of 1st kernel

[Vivek Goyal]

On Fri, Jul 11, 2014 at 10:39:45PM +0800, Baoquan He wrote:
> On 07/11/14 at 10:35am, Vivek Goyal wrote:
> > On Fri, Jul 11, 2014 at 03:16:04PM +0800, Baoquan He wrote:
> > > ->$ ./makedumpfile  --mem-usage  /proc/kcore
> > > Excluding unnecessary pages        : [100.0 %] |
> > > 
> > > Page number of memory in different use
> > > --------------------------------------------------
> > > TYPE			PAGES			EXCLUDABLE	DESCRIPTION
> > > pfn_zero		0x0000000000000000	yes		Pages filled with zero
> > > pfn_cache		0x000000000002b19f	yes		Cache pages
> > > pfn_cache_private	0x0000000000042526	yes		Cache pages + private
> > > pfn_user		0x0000000000026bc3	yes		User process data pages
> > > pfn_free		0x0000000000133f79	yes		Free pages
> > > pfn_hwpoison		0x0000000000000000	yes		Hwpoison pages
> > 
> > Is there a need to display hwpoison pages? I think they are excluded by
> > default. Otherwise reading them might kill makedumpfile process.
> 
> You are right, hwpoison pages are excluded by default. But it truly
> calculated in makedumpfile. I will change it as non-excludable like
> below:
> 
> TYPE			PAGES			EXCLUDABLE	DESCRIPTION
> pfn_hwpoison		0x0000000000000000	No		Hwpoison pages

I think we don't have to display hwpoison pages. It is of no use. Let us
just display the pages which can be excluded using various filtering
levels and total number of pages (without memory hole).

That way people can do some math.

amount of disk space required = total_pages - filtered pages;

Thanks
Vivek